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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5338fca19a170259901e33d6cb93ffb1abf289afdb53c0a6504bba6ea5cc81d' 
  AND token = 'mwNN60B3ibXoIEs4rWQTeyE40QBvhR2WdeZF/DYs+Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}